Discovering available comm ports

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Revision as of 16:03, 8 January 2009

microsoft reader activation active x animal intercourse videos agnus of god movie prime video stores mv torrents new realises movies sony psp movie image converter 2.1 eureekas castle videos kitty fox movies regal movie rocalmo trlidel This code snippet shows how to retrieve the available comms ports on your computer. A CommPort is available if it is not being used by another application. Note the difference between the two examples is that the version for JDK 5.0 up uses generics:

JDK <= 1.4

   /**
     * @return    A HashSet containing the CommPortIdentifier for all serial ports that are not currently being used.
     */
    public static HashSet getAvailableSerialPorts() {
        HashSet h = new HashSet();
        Enumeration thePorts = CommPortIdentifier.getPortIdentifiers();
        while (thePorts.hasMoreElements()) {
            CommPortIdentifier com = (CommPortIdentifier) thePorts.nextElement();
            switch (com.getPortType()) {
            case CommPortIdentifier.PORT_SERIAL:
                try {
                    CommPort thePort = com.open("CommUtil", 50);
                    thePort.close();
                    h.add(com);
                } catch (PortInUseException e) {
                    System.out.println("Port, "  + com.getName() +  ", is in use.");
                } catch (Exception e) {
                    System.err.println("Failed to open port " + com.getName());
                    e.printStackTrace();
                }
            }
        }
        return h;
    }

JDK >= 5.0

   /**
     * @return    A HashSet containing the CommPortIdentifier for all serial ports that are not currently being used.
     */
    public static HashSet<CommPortIdentifier> getAvailableSerialPorts() {
        HashSet<CommPortIdentifier> h = new HashSet<CommPortIdentifier>();
        Enumeration thePorts = CommPortIdentifier.getPortIdentifiers();
        while (thePorts.hasMoreElements()) {
            CommPortIdentifier com = (CommPortIdentifier) thePorts.nextElement();
            switch (com.getPortType()) {
            case CommPortIdentifier.PORT_SERIAL:
                try {
                    CommPort thePort = com.open("CommUtil", 50);
                    thePort.close();
                    h.add(com);
                } catch (PortInUseException e) {
                    System.out.println("Port, "  + com.getName() + ", is in use.");
                } catch (Exception e) {
                    System.err.println("Failed to open port " +  com.getName());
                    e.printStackTrace();
                }
            }
        }
        return h;
    }